Arabella Donn is a fictional character from the novel "The Secret History" by Donna Tartt. She is portrayed as a complex and enigmatic figure, often surrounded by an air of mystery. Her interactions with other characters reveal her depth and the impact she has on their lives. In the story, Arabella Donn serves as a catalyst for various events, influencing the dynamics within the group of friends. Her character embodies themes of beauty, intellect, and the darker aspects of human nature, making her a pivotal part of the narrative's exploration of morality and consequence.